Silkworm from Japan. 387 
flagged much this morning; took away the last larva from the 
greenhouse ; changed the sprays, syringed them well. 
May 23rd. Temperature much the same as 22nd. One larva 
emerged ; washed the eggs in water, as they seemed again covered 
with mould. Two of the lot No. 4 sank, the rest floated—opened 
these two and found therein a little yellow serum, no trace of a 
worm. 
May 24th. Minimum temperature 60°, dull morning; three larvee 
out vigorous. The larvae which were under glass cylinders seemed 
less healthy than those under zine cylinders, being of a dirty 
brown yellow hue, whereas the others were of a brighter tint. 
This was probably due to a less perfect ventilation. One larva 
of No. 3 was born at 5 p.m. 
May 25th. Colder, minimum temperature upstairs 55°; at 8 a.m. 
60°; changed sprays. The Quercus pedunculata is now in full 
leaf; Q. sessiliflora is a fortnight later in coming out, and is now 
scarcely in full leaf; the Turkey oak and moss-cup oak and 
Q. dentata are also now just coming into leaf. Leaves of all these 
varieties were given to the larve, and they seemed to thrive indis- 
criminately on all; but the Q. dentata seems to havea crisp, less 
tender leaf, and is therefore better adapted for the larvee later on. 
On the first tray there are nineteen larvee which have now moulted 
for the first time: on the second tray thirty-three larva com- 
mencing their first moult; on the third tray seventeen larve about 
a fortnight old; on the fourth tray twenty-two about one week old; 
on the fifth tray five babies and four invalids; six more are left on 
an oak tree in pot, passing through their first moult: total, 106 
out of 161 in all born; therefore fifty-five are missing since birth.* 
May 26th and 27th. Temperature about 60°; one larva, having 
just moulted, turned torpid and of a pale colour, seemed shrunken, 
the spines on the back no longer standing out stiff, but depressed ; 
it subsequently died. 
May 28th. Changed food ; 105 larve in the four trays. 
May 29th. One larva out, the last that hatched; temperature 
about 60°. 
May 31st. Changed food on trays, and counted larvee; 106 
doing well; temperature 58°--60°. 
* It is always convenient, in rearing larve in quantity, to keep the lots as 
nearly as possible of the same age, so that they all moult together. This is 
carried to perfection in rearing the mulberry silkworms in France and Italy : 
there the brood is hatched out in aday, the moults are passed to a day, and 
the cocoons are all spun to a day, and the moths again emerge to a day. 
VOL, V. THIRD SERIFS, PART V.—MARCH, 1867, EE 
